Communications: radio wave antennas – Antennas – Wave guide type
Patent
1979-05-09
1981-04-21
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343786, H01Q 1913
Patent
active
042635993
ABSTRACT:
A parabolic reflector antenna, designed to discriminate between incoming and outgoing waves having mutually orthogonal planes of polarization, has a ratio R between focal distance f and diameter D which, for optimum efficiency and cross-polarization decoupling, lies between 0.46 and 0.5 and operation in the TE.sub.11 mode and above 0.6 for operation in the dual TE.sub.11 +TM.sub.11 mode. An associated feed, in the shape of a slightly tapering horn of circular cross-section connected to a waveguide of square cross-section, has a relative aperture .alpha., defined as the ratio between its aperture radius r and the wavelength .lambda..sub.o at the center of the operating frequency band, which in the first instance ranges between 0.52 and 0.6 and in the second instance is given by kR+h with k.apprxeq.1 and h between about 0.1 and 0.15.
REFERENCES:
patent: 3599219 (1971-08-01), Holtum
patent: 3696435 (1972-10-01), Zucker
patent: 3740755 (1973-06-01), Grenzebeck
patent: 3864688 (1975-02-01), Hansen et al.
Ludwig; IEEE Transactions on Antennas and Propagation, Jan. 1973, pp. 116-119.
Bielli et al.; Feed Design Method for Reflector Antennas CSELT, No. 2, Sep. 1974, pp. 19-24.
Bielli et al.; "Proceedings of the Sixth Colloquium on Microwave Communication", Budapest, Aug. 29, 1978-Sep. 1, 1978, vol. I, III-6/37.1-III-6/37.4.
Bielli Paolo
De Padova Salvatore
Cselt-Centro Studi e Laboratori Telecomunicazioni S.p.A.
Lieberman Eli
Ross Karl F.
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